where 's the java sample source

where 's the java sample source

I'm japanese, sorry my poor English.
I'm trying to make EC-Site(Web) with in Paypal Service.
EJDK 1.6.0
EF/W SAStruts
Eand UI useing Ajax(JSON)
I heard our service is mach in "Chained Payments" from Paypal techSupport.
So I want sample source of this.
But doesn't have a document in Japanese.
I heard the sample source URL from Paypal techSupport.
(https://github.com/paypal)
I download "sdk-packages-gh-pages.zip" and unzip and grep by "chained",
but I can't reach them.
Please teach me the detail sample source URL of "Chained Payments" moves.
And all API of "Chained Payments" flow to use.
Sorry in the simple question..